Apparatus for determining gauge profile for flat rolled material with laser-based lap counter

ABSTRACT

A gauge profile apparatus ( 100 ) includes a gauge profile system ( 104 ) and a lap count system ( 106 ) for determining an average three-dimensional profile over the length of a sheet coil ( 10 ). The gauge profile system ( 104 ) includes a lap profile measuring device ( 112 ) which will make a distance determination between top and bottom surfaces for the sheet coil ( 10 ). A second embodiment of a lap count system ( 600 ) is also provided, which utilizes a pair of reflectance lasers and a positioning system.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority of U.S. Provisional Application Ser.No. 61/230,408 filed Jul. 31, 2009.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

REFERENCE TO A MICROFISHE APPENDIX

Not applicable.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to industrial measurement systems and, moreparticularly, to apparatus and methods for determining gauge profilesfor rolled materials, including the use of a lap counter employing laserprinciples.

2. Background Art

Throughout relatively recent history, a substantial amount ofdevelopment work has occurred with respect to apparatus and processesfor manufacturing, forming and shaping various types of materials,including, for example, metallic materials. One such metallic materialin worldwide use is steel. Steel has been used for a substantial part ofrelatively modern history. Steel is an alloy consisting mostly of iron,with a carbon content often within the range of 0.02% to 2.04% byweight, typically depending on grade. Although carbon is the mostcost-effective alloying material for iron, various other elements may beused, such as manganese and tungsten. The carbon and other elements actas a hardening agent, preventing dislocations in the iron atom crystallattice from sliding past one another. The amount of alloying elementsand the form of their presence in the steel (e.g. solute element,precipitated phase) controls qualities such as the hardness, ductilityand tensile strength of the resulting steel.

Long before even the Renaissance, steel was produced by various and whatmay be characterized as “inefficient” methods. However, steel use becamemore common after more efficient production methods were devised in the17th Century. With the invention of the Bessemer process in the mid-19thcentury, steel became what was then a relatively inexpensivemass-produced good. Further refinements in the process (e.g. basicoxygen steel making) lowered cost of production, while increasing metalquality. Today, modern steel is generally identified by various gradesof steel defined by various standards organizations.

Today, steel and other materials are produced and generated throughvarious apparatus so as to obtain differing sizes and shapes of theresultant products. For example, one known method for forming andshaping steel utilizes a process known as “continuous casting.” Thisprocess involves the pouring of liquid steel directly into semi-finishedshapes, such as slabs, blooms, blanks, or billets. The continuouscasting process typically produces a slab of steel having certain rangesof pigments and width. These slabs are often cut into pieces of varyinglengths, dependent upon commercial particulars. In some instances, it isdesired to produce a flat, rolled steel strip from such material. Toproduce such a rolled steel strip, a discreet slab can be reheated, andpassed through one or more hot rolling millstands. Such hot rollingprocedures can result in reducing the thickness to, for example,approximately 2.5 millimeters. To obtain further reductions inthicknesses, the materials resulting from the hot rolling process can bepassed through one or more reducing/finishing cold rolling millstands.

Other advancements in technologies associated with the rolling ofmetallic stock (such as stripped steel or the like) have been madeduring the last several decades. These advances have applied not only tosteel, but to other types of metals. In fact, a substantial amount ofresearch and development has occurred during the past several years withrespect to the rolling of non-metallic products, such as plastics andthe like.

In the rolling of material stock, such as steel, a problem has existedwith respect to maintaining a uniform gauge or thickness of the materialduring the rolling process. Correspondingly, this problem has also beenpresented with respect to means for measuring the gauge or thicknessafter the rolling process has been completed. In this regard, it isparticularly difficult to obtain gauge measurements when the steel orother materials are in a coiled configuration. For example, certainorganizations may operate as steel service centers, which purchasecoiled sheet steel from rolling mills. Such service centers may, forexample, function so as to slit or otherwise process the coiled sheetmaterial for customers, which may include stampers, roll formers and thelike. In the past, it has been substantially difficult to obtain anaccurate determination of coil thickness or, what may be characterizedas a “gauge profile,” prior to undertaking the slitting or otherprocesses being performed by the service center. However, the slittingof the coiled sheet material cannot be undertaken until after there is acustomer allocation for the service center. Accordingly, the servicecenter cannot obtain an accurate gauge profile until after such customerallocation are exposed to substantial monetary risks due to an inabilityto accurately determine coil thickness prior to processing. These risksare comprised of losses through devalued material, lost machine time,lost freight, customer downtime and subsequent effects.

Various systems have been developed and are known in the prior art whichare directed to material gauge measurements and facilitating theaccuracy thereof.

For example, Hold, U.S. Pat. No. 4,542,297 issued Sep. 17, 1985,discloses an apparatus for measuring a thickness profile of steel strip.The apparatus includes a radiation source which is reciprocally movablein a stepwise fashion across the strip width on one side thereof. Asingle, elongated detector on the other side of the strip is alignedwith the scanning source. This detector may be a fluorescentscintillator responsive to the incident radiation. In turn, the incidentradiation is dependent on the degree of absorption by the strip.

In addition to the foregoing, Hold discloses apparatus for sensing thedegree of excitation in the detector, with the sensing occurring insynchronism with the scanning source. This combination is used toprovide an output which is considered to be representative of thethickness profile of the steel strip. The profile is then displayed on atelevision screen. A thickness gauge (disclosed as being “conventional”by Hold), which may involve x-ray technology, is used in conjunctionwith the profile gauge, so as to compensate the output of the profilegauge for any variations in the strip thickness along the length of thecoil.

Hold further describes the concept that the current market for hotrolled strip (with the term “strip” being described by Hold as including“sheet” and “plate” steel) requires a relatively smooth and cigar-shapedprofile. Hold states that desired profiles have less than 5 micronsedge-to-edge thickness differential. In addition, Hold also states thatthe “crown” should be less than 70 microns. The crown is defined asbeing the difference between the thickness at the edges of the strip andthe center thickness of the strip. It should be noted that Hold isdescribing thickness measurements occurring as the strip is beingrolled.

Hold further describes the concept that the measurement information haspreviously been obtained off-line from contact measurements. However,such off-line measurements only provide what are considered to be“historical” measurements. Prior systems have been used which can becharacterized as being “on-line” through the use of a scanning mechanismproviding a relatively rapid read-out. In this manner, Hold describesthe concept that relatively rapid corrective action may be taken. Withthe on-line system, measurements are taken across the width by combiningthe physical traverse of a single radiation source and an associateddetector on two limbs of what is characterized as a “C”-frame across thestrip. Alternatively, a physical traverse of a single radiation sourcemay be made across the strip with a series of fixed detectors on theother limb, or a series of fixed sources with equal or different fixeddetectors. Hold states that movement of the frame is relativelycumbersome, slow and energy consuming. Alternative movements ofindividual source/detector apparatus in synchronism is characterized byHold as being relatively complex. Also, with two moving mechanisms, wearand inertia are considered problems. In an embodiment using a series offixed detectors, measurements can be made only at a number of discretepoints, and difficulties may arise in “collection” of the data fromthese detectors, as well as ensuring that each detector responds toradiation incident only on itself and not on adjacent detectors.

In Hold, the radiation source is a radio-isotope (which may be Americium241) which is driven across the strip width and relatively rapiddiscrete steps by a pulsed “stepper” motor. Further, a linear array ofsuch sources is disclosed, disposed in the direction of the travel ofthe strip for purposes of enhancing the output.

The detector is considered to be continuous in the sense that it is asingle integrated unit. As earlier described, the unit may be afluorescent plastic scintillator, with a massive number of scintillationparticles being embedded in a plastic matrix. Light output from theseparticles is collected by photomultipliers mounted on each end of theplastic rod. The edge of the strip, utilized as the datum for the trace,is identified by an instantaneous change in the amount of radiationincident on the scintillator, as the source transverses the strip edge.The time-base for the trace (i.e. the x-coordinate) is considered to begoverned by the stepper motor at each step, so as to effect thereciprocating scan across the strip.

In brief summary, Hold discloses an apparatus for measuring profilethickness which utilizes a radiation source and detector in order todetermine the strip profile. This apparatus essentially does a“head-to-tail” representation, by performing linear gamma inspectionacross the face of the strip at multiple points. It should be noted thatHold requires that the steel strip not be in an coil form. Instead, ifthe strip had been coiled, the coil needs to be opened up and traversethe measuring apparatus, in order to gather the requisite information.

A relatively earlier apparatus for measuring thickness of sheet metaland the like is disclosed in Bendix, et al., U.S. Pat. No. 2,935,680issued May 3, 1960. The Bendix device is specifically directed togauging the thickness of sheets of magnetizable metal. The apparatusincludes two equivalent electromagnets, each having a central core and asurrounding pole. A coil is supported on each core, with a commonalternating current source for the coils. The source is sufficient so asto cause the sheets under test to be magnetically saturated by theelectromagnets during at least a portion of the alternating currentcycle. The core and the pole of the first magnet are bridged by areference sheet of metal, and the core and pole of the second magnet arebridged by the sheet of metal under test. Branch resistance circuits areconnected to the alternating source on opposite sides of the coils, andan adjustable resistance unit is connected to the resistance circuits.The adjustable resistance unit is connected to the alternating currentsource intermediate the coils, and a means for indicating measurementsis positioned in series with the adjustable unit.

In summary, the apparatus disclosed in Bendix, et al. uses analternating current, and a process which induces and measures themagnetic field around a charged sheet as the sheet flows into a die. Theapparatus essentially measures the timing required for the enteringmaterial to become magnetically saturated. The timing is then translatedinto a thickness measurement. Again, Bendix, et al. requires anymaterial under test to be unrolled and to enter the measurement systemone layer or one sheet at a time. Also, it is obvious that in view oftheir required magnetic characteristics, the Bendix, et al. system islimited to measurement of ferrous materials.

Bertin, et al., U.S. Pat. No. 4,301,366 issued Nov. 17, 1981 disclosesan apparatus and processes for measuring strip thicknesses in a materialstrip generated as an output from a mill. A radiation source anddetector are positioned at a gauging station, with the stream ofmaterial moving pass the station. As the material moves pass thestation, an electrical signal is generated which varies as a function ofthe material at the station. The signal includes a lower frequencycomponent, higher frequency cyclical component and higher frequencynoise component. A circuit for providing a thickness output varying as afunction of the lower frequency component of the signal, and a circuitproviding an output indicating chatter varying as a function of thehigher frequency cyclical component, are utilized. Bertin, et al. alsodisclose apparatus for providing both digital and analog versions oftheir system.

In general, Bertin, et al. disclose an apparatus and methods fordetecting “chatter” in systems directed to thickness measuring of stripproducts. More specifically, in processes such as the cold rolling ofsteel, there may be relatively prolonged regions of high frequencyvariations in the product. An example is a thickness variation, which iscommonly referred to as chatter. A relatively common cause of chatter isa mechanical resonance in the rolling mill, which tends to make therolls “bounce.” This activity gives rise to a thick (or thin) spot inthe steel strip for each bounce. These thickness variations can beconsidered to be quality defects. More specifically, a primary purposeof the Bertin, et al. system is to collect thickness information so asto detect signs of chatter. The chatter can be characterized as asymptom of the harmonic bouncing of the gauge-reducing rollers whichshow up in the material as cyclical thickness variations across thelength of the material strip. As with certain of the aforedescribedreferences, the Bertin, et al. apparatus cannot be utilized withmaterial strips, while the strips are in coil form. Also, it appearsthat Bertin, et al. require that the material strip be in motionrelative to the gauging or chatter measuring station.

Another relatively early disclosure of an apparatus and method fordetermining average thicknesses of metallic strip materials from rollingmills is set forth in Deul, Jr., et al., U.S. Pat. No. 2,356,660 issuedAug. 22, 1944. The patent describes the concept that in the rolling ofmetallic stock, such as strip steel, it is a problem to measure thethickness of the material during the rolling process, and to obtain somemeans of determining the thickness throughout the entire width of thetraveling strip material. The disclosed measuring apparatus is usedwhile the strip material is being coiled on a reel. A radial reel zoneis provided, with a counting apparatus for determining the number ofrevolutions of the reel corresponding with the predetermined radialthickness of the coil strip defined by the entry and exit of the outerface of the coiled strip on the reel. A synchronistic control isutilized with the counting apparatus which includes an actuating memberdriven in synchronistic relationship with the reel. Mechanical clutchingdevices are utilized intermediate the rotatable coil winding reel andthe revolution counter, and control apparatus are utilized forsynchronizing the starting and stopping of the counting mechanism. Theautomated control apparatus includes photo-electric control devices,with a series of light beams being generated coincident with the stripsurface at the beginning of the radial zone. A second beam is disposedso as to be coincident with the strip surface at the ending of theradial zone. In general, the Deul, Jr. et al. patent reference disclosesa method for calculating the average thickness of coiled materials bymeasuring the elevation of the coil from the mandrel that the materialsare being spooled onto, and dividing this measurement by the number oflaps. As with other known systems, the Deul, Jr., et al. system is notutilized with the material while it is in coil form, but instead itcounts the number of turns a device makes in the coiling process, thusrequiring motion. Also, this system essentially “assumes” that the crosssection of the coil material is a true rectangle. That is, the systemdoes not take into account the commonly known edge-crown-edge profilewhich results during manufacture of various types of rolled materialstrips.

As previously described herein, a number of the known, prior art systemsfor measuring material strip thicknesses must be utilized while thestrip is in an “unrolled” or “uncoiled” state. However, as alsopreviously described, for companies such as steel service centers whichpurchase sheet steel in coiled states, it has been extremely difficultto determine strip gauge. To date, certain processes for estimatinggauge ranges are known for use with coils consisting of sheet steel orthe like. Some of the known gauge range estimates are created frommeasurements which consist of the highest and lowest micrometer/caliperreadings which are typically taken during a receiving process for thecoils on the production floor. Unfortunately, the only portions of theincoming coil which are accessible for purposes of taking these readingsessentially comprise the edges and the outside/inside laps of the coil.These areas are inherently considered to be the most erratic and least“representative” areas of the coil. For example, edges of coilstypically have a “feather” affect and provide relatively low thicknessmeasurements. Correspondingly, heads and tails of coils are typicallyhigh and provide relatively large thickness measurements. Thesecircumstances result in the generation of unreliable data. It isapparent that such unreliable data can result in attempts to apply coilsimproperly to customer orders.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

The invention will now be described with reference to the drawings, inwhich:

FIG. 1 is a perspective view of a sheet steel coil which may be utilizedas a work piece under test with a gauge profile apparatus in accordancewith the invention;

FIG. 2 is an illustration showing a cross section of a coil and therelationship between thicknesses of coil edges and the coil crown;

FIG. 3 is a partially diagrammatic and partially block diagramindicating the processes associated with the gauge profile apparatus inaccordance with the invention, and the specific input and outputparameters utilized by the apparatus in accordance with the invention;

FIG. 4 is a diagrammatic view of a cross section of a coil under test,and the physical positioning of a gauge profile system utilized with theapparatus in accordance with the invention;

FIG. 5 is a diagrammatic illustration of the relative positioning of thecoil under test with a lap count system which may be utilized with theapparatus in accordance with the invention;

FIG. 6 is a perspective view of a linear slide which may be utilizedwith the gauge profile system;

FIG. 7 is a graphic illustration of the relationship among power, speedand torque characteristics of a stepper motor which may be utilized withthe gauge profile system in accordance with the invention;

FIG. 8 illustrates a bearing compartment which may be utilized as partof an ultrasonic thickness sensor for the gauge profile system inaccordance with the invention;

FIG. 9 is a perspective view of a plug bearing which may be utilizedwith the bearing compartment illustrated in FIG. 8;

FIG. 10 is a vertical cross section of the bearing plug illustrated inFIG. 9;

FIG. 11 is a perspective view of a platform and clamping configurationfor the sensor utilized with the gauge profile system in accordance withthe invention;

FIG. 12 is a partially elevation and partially diagrammatic view ofcertain components of the sensor platform and clamping configurationillustrated in FIG. 11;

FIG. 13 is a perspective view of the interior of the driven sprocketenclosure and associated components which may be utilized with the gaugeprofile system in accordance with the invention;

FIG. 14 is a further perspective view of the driven sprocket enclosureillustrated in FIG. 13, but showing the enclosure in a state with thecover secured thereon;

FIG. 15 is a block diagram of certain components associated with thecontrol system for the gauge profile system in accordance with theinvention;

FIG. 16 is a partially perspective view of a stand which may be utilizedwith a lap count system which, in turn, may be utilized with the gaugeprofile apparatus in accordance with the invention;

FIG. 17 is a partially perspective and exploded view of the standillustrated in FIG. 16;

FIG. 18 is a partially diagrammatic and partially functional blockdiagram of the control system for the lap count system in accordancewith the invention;

FIG. 19 is an image in an original state which was produced from aprototype of the lap count system in accordance with the invention;

FIG. 20 is an illustration of a partial image acquisition utilizingprocesses performed by the lap count system in accordance with theinvention;

FIG. 21, like FIG. 19, illustrates an original image of the coil laps asproduced by the lap count system in accordance with the invention;

FIG. 22 is an image of the laps illustrated in FIG. 21 following animage averaging procedure undertaken by the lap count system inaccordance with the invention;

FIG. 23 illustrates a plot of grayscale values obtained by the lap countsystem in accordance with the invention, along the coil radius;

FIG. 24 is an illustration of the frequency characteristics of a lowpass filter which may be utilized with the lap count system, forpurposes of noise reduction;

FIG. 25 is an illustration of averaged grayscale values similar to FIG.23, but with the plot utilizing data filtered through the low passfilter with the characteristics illustrated in FIG. 24;

FIG. 26 is a photographic image showing a raw photograph of the coillaps taken through the use of the lap count system in accordance withthe invention;

FIG. 27 is a plot of the average grayscale values along the coil radiusgenerated through the use of a lap count system;

FIG. 28 is similar to FIG. 27, but illustrates the plot of grayscalevalues after focusing techniques have been applied to the lap countsystem in accordance with the invention;

FIG. 29 is a perspective view of a second embodiment of a gauge profilesystem which may be utilized in accordance with the invention;

FIG. 30 is an exploded view of the gauge profile system illustrated inFIG. 29;

FIG. 31 is a perspective view of the case assembly of the gauge profilesystem illustrated in FIG. 29;

FIG. 32 is a perspective view of the case bottom of the case assemblyshown in FIG. 31;

FIG. 33 is a perspective view of the case bottom plate of the caseassembly shown in FIG. 31;

FIG. 34 is a perspective view of the case top plate of the case assemblyshown in FIG. 31;

FIG. 35 is a partially perspective view of the roundabout of the caseassembly shown in FIG. 29;

FIG. 36 is a perspective view of a PDA standoff of the case assemblyshown in FIG. 29;

FIG. 37 is a perspective view of an Olympus standoff of the caseassembly shown in FIG. 29;

FIG. 38 is a perspective view of the battery bottom clamp of the caseassembly shown in FIG. 29;

FIG. 39 is a perspective view of a battery top clamp of the caseassembly shown in FIG. 29;

FIG. 40 is a perspective view of the wand assembly of the case assemblyshown in FIG. 29;

FIG. 41 is a perspective view of the wand handle of the wand assemblyshown in FIG. 40;

FIG. 42 is a perspective view of the wand bottom plate of the wandassembly shown in FIG. 40;

FIG. 43 is a perspective view of the wand main of the wand assemblyshown in FIG. 40;

FIG. 44 is a perspective view of the wand cover of the wand assemblyshown in FIG. 40;

FIG. 45 is a partially schematic and partially diagrammatic illustrationof the gauge profile system as utilized with the lap count system;

FIG. 46 is a simplified perspective view of the gauge profile system asit may be utilized with the sheet coil;

FIG. 47 shows a pair of images of the PDA of the gauge profile system,illustrating a simulated image file and data that will be saved;

FIG. 48 is an illustration of the encoder signal structure which may beutilized with the string encoder of the gauge profile system;

FIG. 49 is a perspective view of the transducer wand utilized with thegauge profile system;

FIG. 50 is an exploded view of the wand assembly for the gauge profilesystem, showing various components of the wand assembly as previouslyillustrated in individual illustrations;

FIG. 51 is a block diagram illustrating a functional sequence for theserial relay controller;

FIG. 52 is a block diagram showing functional steps associated with theencoder count controller;

FIG. 53 is a functional state diagram of the software utilized with thePDA for the gauge profile system;

FIG. 54 is a state functional block diagram illustrating the “start”state;

FIG. 55 is a state functional block diagram illustrating the “add coil”state;

FIG. 56 is a state functional block diagram showing the “import coilsdata file” state;

FIG. 57 is a state functional block diagram illustrating the “gaugetesting” state;

FIG. 58 is a state functional block diagram showing the “data transfer”state;

FIG. 59 is a state functional block diagram showing the “process thecollected data” state;

FIG. 60 is an illustration of an example set of equations which may beutilized with “curve-best-fit” equations for the data collected;

FIG. 61 is a pair of perspective views showing a lap count systemassembly 600 using laser devices in accordance with the invention;

FIG. 62 illustrates analog voltage outputs from an amplifier using thelap count system assembly 600, with reflectance from the coil beingmeasured with a CMOS camera, and with the analog voltage outputsindicative of the reflectance;

FIG. 63 illustrates distinctions between measurements along a radialline and a non-radial line;

FIG. 64 is a table identifying reported thicknesses versus nominalthickness and angle of a radial line from actual tests;

FIG. 65 is a perspective view of a linear encoder which can be utilizedin accordance with the invention;

FIG. 66 identifies the procedure utilizing the laser output reflectanceand the encoder for determining lap thickness;

FIG. 67 is a graph illustrating measured reflectance versus distancesfrom an actual test;

FIG. 68 is essentially the same graph as FIG. 67, but showing theprocedure for determining lap thicknesses based on a local minimamethod;

FIG. 69 is a graph (in combination with a large graph) showingreflectance versus distance from actual tests, and illustrating thedetermination of lap thicknesses based on a midpoint method;

FIG. 70 is a graph similar to FIG. 69, illustrating reflectance versusdistance from an actual test, and further showing a procedure fordetermining lap thickness based on a curved fitting method;

FIG. 71 is an identification of parameters associated with batterypower, laser system weight and laser sensitivity;

FIG. 72 is a concept block diagram showing the various componentsassociated with the lap count laser system assembly 600;

FIG. 73 identifies various test parameters associated with a proof ofconcept test performed using the lap count system assembly;

FIG. 74 is a set of tables identifying results from the proof of concepttests utilizing the local minima, midpoint and curve fit methods fordetermining lap thicknesses; and

FIG. 75 is an exploded and perspective view of a lap count systemassembly 600 in accordance with the invention.

DETAILED DESCRIPTION OF THE INVENTION

The principles of the invention will now be described with respect to alap count system assembly 600 as primarily illustrated in FIGS. 61-75.However, as background and to explain the entirety of a gauge profileapparatus which may utilize the system assembly 600 in accordance withthe invention, a gauge profile apparatus 100 will first be disclosedherein, and illustrated in FIGS. 3-28. Further, a second embodiment of agauge profile system 400 is also described herein and also illustratedin FIGS. 29-60. It should be emphasized that whether the lap countsystem assembly 600 is used with the gauge profile system 104 or thegauge profile system 400 disclosed herein, the resultant purposes for agauge profile apparatus in accordance with the invention are the same.

The gauge profile apparatus 100 is adapted to be used with flat rolledmaterials which have been formed into coils. The materials may be sheetsteel, other types of metals or other types of materials (such asplastics or the like). The primary purpose of the gauge profileapparatus 100 is to project or otherwise “estimate” the gauge thicknessat any point of a coil with a relatively high degree of accuracy. Theresultant output from the gauge profile apparatus 100 can becharacterized as a three dimensional (“3D”) gauge projection.

As previously described in the section entitled “Background Art,”companies such as steel service centers purchased coiled sheet steelfrom various mills. Service centers, such as the assignee of the currentinvention, may undertake activities such as slitting the coiled sheetsteel for use by various stampers and roll formers. As also earlierdescribed, material can be compromised as a result of an inability toaccurately determine coil thickness prior to slitting. Also, problemsexist with respect to lost machine time, lost freight, customer downtimeand the like. For purposes of describing concepts associated withdetermination of coil thicknesses, an example embodiment of a sheet coil10 is illustrated in FIG. 1. A cross section of the sheet coil 10 isfurther illustrated in FIG. 2. As shown therein, the sheet coil 10 mayconsist of sheet steel or other materials, as previously described.Parameters associated with the sheet coil 10 are illustrated in FIG. 1,and include a series of laps 18. The outermost lap is shown as theoutside lap 12 while the innermost lap is shown as inside lap 14. Thedifference in relative positions of the ends of the outside lap 12 andinside lap 14 is shown as the overlap length 16. The outermost diameterof the coil 10 is identified as the outside diameter 20, while FIG. 1also illustrates the inside diameter 22. A lap count radius 24 isfurther shown in FIG. 1, and is defined as the radial length between thecenter point of the sheet coil 10 and the outside lap edge 12. In turn,the total coil thickness 26 is defined as the thickness of the totalnumber of laps, as illustrated in FIG. 1.

Currently, gauge range estimates, when not provided by outsideprocessors of the coiled sheet materials, are typically created fromhighest and lowest micrometer/caliper readings taken during thereceiving process on the production floor. Unfortunately, however, andas apparent from the overall shape and configuration of the sheet coil10 shown in FIG. 1, the only portions of the sheet coil 10 that areaccessible for purposes of taking such readings are the edges, outsidelap 12 and inside lap 14. However, these areas of the sheet coil 10 areknown to be inherently the most erratic and least representative areasof the sheet coil 10. More specifically, the edges typically have whatcan be considered a “feather” effect and are relatively low. Incontrast, the “heads” and “tails” of the sheet coil 10 are typicallyhigh. Such circumstances generate unreliable data which often results inan attempt to apply sheet coils improperly to customer orders.

In this regard, it has been noted that rolls generated at steel millsand the like typically have a slightly concave shape for purposes ofcontrolling the direction of slabs/coils, while performing gaugereduction. The result of the shape is a coil which would typically havethe cross section of sheet coil 10 illustrated in FIG. 2. It should beemphasized that FIG. 2 is somewhat of a “exaggerated” cross section forpurposes of description. As shown therein, the relative center of thesheet coil 10 has a thickness which is greater than the thickness whichexists at its edges. For purposes of description, FIG. 2 illustrates thesheet coil 10 as having an edge gauge 28. The thickness portion 30 ofthe sheet coil 10 is at or near the center of the coil 10, and istypically referred to as the crown or crown gauge 30. The actual amountof crown will typically vary from mill to mill and, in fact, even coilto coil.

Notwithstanding the foregoing, it has been found that although the gaugeof the sheet coil 10 can change from head to tail, the relativethickness between the edge gauges 28 and the crown gauge 30 will remainrelatively constant. Accordingly, if the width, weight and length of thesheet coil 10 could be accurately determined, and a relatively accurateprofile of the crown 30 could be ascertained, then the gauge at anypoint of the sheet coil 10 should possibly be able to be projected witha relatively high degree of accuracy.

FIG. 3 illustrates a partially symbolic and partially functional blockdiagram of the inputs, outputs and processes performed by the gaugeprofile apparatus 100. As previously stated, the ultimate output desiredthrough the use of the gauge profile apparatus 100 in accordance withthe invention is an average three-dimensional profile over the length ofthe sheet coil 10. Referring specifically to FIG. 3, the gauge profileapparatus 100 is shown as having a symbolic boundary 102. The apparatus100 essentially comprises two main or primary systems; namely, a gaugeprofile or cross-section profile system 104 and a lap count system 106.The symbolic boundaries of the systems 104, 106 are illustrated in FIG.3.

The gauge profile or cross section profile system 104 essentiallydetermines the relative distribution of material of the sheet coil 10for a cross section of the material. As will be described in subsequentparagraphs herein, and in accordance with one embodiment of theinvention, the gauge profile system 400 utilizes an ultrasonic gaugedevice for bombarding the sheet coil material with high frequency soundwaves. Accordingly, inputs for the gauge profile system 104 aresymbolically illustrated in FIG. 3 as being the sheet coil 10 shown asinput 108 and a determined coil sound velocity 110. The inputs 108, 110are applied to a lap profile measuring device 112, which effectivelymeasures the outside/inside lap profile. The lap profile measuringdevice 112 will essentially take the results of the bombardment of thesheet coil 10 with the high frequency sound waves, and translate thetiming between the wave reflections or “echoes,” into a distancedetermination between top and bottom surfaces for the sheet coil 10. Aswill be described in subsequent paragraphs herein, the lap profilemeasuring device 112 or calculations associated therewith are used inconjunction with a linear slide system which allows for the ultrasonicgauge measurement to traverse across the width (shown as width 34 inFIG. 1) of the sheet coil 10, while simultaneously capturing thicknessmeasurements during traverse. The output of the lap profile measuringdevice 112 is therefore shown symbolically in FIG. 3 as the lap profileparameter 114.

As earlier stated, the gauge profile apparatus 100 also includes, inaddition to the gauge profile system 104, a lap count system 106. Thesystem 106, and the particular embodiment of the gauge profile apparatus100 in accordance with the invention, comprises a system using acommercially available ultrasonic distance sensor and camera (with thecamera having an internal processor) for purposes of determining theaverage thickness of the sheet coil 10. This determination is achievedthrough the counting of the exact number of laps of the sheet coil 10,as well as making a determination of the outside diameter of the sheetcoil 10 and the inside diameter of the sheet coil 10. As will be madeapparent from subsequent description herein, this information, combinedwith a measurement of the width 34 of the sheet coil 10, allows for thevolume of the sheet coil 10 to be determined with a substantial amountof relative accuracy. With the volume combined with a weightmeasurement, a determination of the “average gauge” of the sheet coil 10may be determined.

More specifically, and turning to FIG. 3, the illustration shows,somewhat symbolically and somewhat diagrammatically, an input to the lapcount system 106 as comprising the coil weight 116. The coil weight 116can be determined by any suitable and well known apparatus andprocedures. In addition to the coil weight 116, the material density 118and the width (shown symbolically in FIG. 3 as width 120) are applied asinput parameters to a functional calculation which can be characterizedas an average lap gauge calculator 124. The output of the average lapgauge calculator 124 is a representation of the average lap gauge, shownas lap gauge 126 on an output from the average lap gauge calculator 124.

In addition to the inputs consisting of the coil weight 116, materialdensity 118 and width 120, the lap count system 106 also includes, as aninput, the overall shape and configuration of the sheet coil 10. Throughthe use of the aforedescribed distance sensor and camera, coildimensions can be obtained, through the devices shown in a symbolicformat as the coil dimension calculator 128. Again, the calculator 128is merely a symbolic representation and clearly includes inputparameters coming from outputs of a distance sensor and camera.

The outputs of the coil dimension calculator 128 are illustrated asoutputs 130, 132, 134 and 138. More specifically, output 130 representsa determination of the outside diameter (previously shown in FIG. 1 asoutside diameter 20 of the sheet coil 10). The output 132 consist of theinside diameter (previously identified as the inside diameter 22 in FIG.1). Correspondingly, output 134 represents the lap count (identified asthe number of laps 18 in FIG. 1). These output parameters can bedetermined with relatively high accuracy. Each of these outputsconsisting of the outside diameter, inside diameter and lap count areapplied as inputs to devices which can calculate the length of the sheetmaterial of the sheet coil 10. This coil length determination issymbolically shown in FIG. 3 as being made by the coil length calculator136. The output of the coil length calculator 136 is the output shown inFIG. 3 as coil length parameter 140. The coil length parameter 140, inturn, is applied as an input to the previously described average lapgauge calculator 124. With the information consisting of the coil weight116, material density 118, width 120 and coil length 140, the averagelap gauge calculator 124 can readily determine the average lap gauge126.

As further shown in FIG. 3, the gauge profile apparatus 100 applies theoutput of the lap gauge calculator 124, consisting of the average lapgauge 126, as an input to what is referred to in FIG. 3 as an average 3Dprofile calculator 142. Also applied as an input to the profilecalculator 142 is the previously described lap profile 114 whichcomprises the output from the gauge profile system 104. With the lapprofile 114 and average lap gauge 126, the 3D profile calculator 142 cangenerate an estimation of the average 3D profile over the entirety ofthe length of the sheet coil 10. This is shown as average 3D gaugeprofile parameter 144. In addition to the output 144 consisting of theaverage 3D gauge profile, the gauge profile apparatus 100 can also beutilized to generate a parameter shown in FIG. 3 as the peak-to-peakdistance 138. These distances can be calculated directly by the coildimension calculator 128 through the measurement of the parameters ofthe sheet coil 10.

Physical element description, as well as additional functionaldescription, will now be provided for the gauge profile system 104,primarily with respect to FIGS. 4 and 7-15. FIG. 4 illustrates relativepositioning of the physical configuration of the gauge profile system104 on the sheet coil 10, with the sheet coil 10 shown in partial crosssection in FIG. 4. With reference thereto, the gauge profile system 104includes a linear slide, the major components of which are alsoillustrated in FIG. 6. The linear slide 150 includes an end block 152having a reversal block 153 (see FIG. 6) mounted therein. The linearslide 150 also includes an upper belt arm 154 and a lower belt and slidearm 156, the arms 154 and 156 being spaced apart and parallel to eachother. For purposes of securing the gauge profile system 104 to thesheet coil 10 during measurement procedures, the linear slide 150 alsoincludes an end clamp 158 which clamps the linear slide to one end ofthe sheet coil 10. A second clamp identified as adjacent clamp 160, isutilized to clamp the linear slide 150 to the other edge of the sheetcoil 10. In addition to the foregoing, and consisting of one of theprincipal elements of the gauge profile system 104, a thickness sensor162 is included which is moveably mounted to the lower belt and slidearm 156. As described earlier herein, the thickness sensor 162 is acommercially available ultrasonic gauge device which will bombard thesheet coil 10 with high frequency sound waves. The timing between wavereflections or echoes can be translated into distance determinationsbetween top and bottom surfaces for the sheet coil 10. The purpose forthe linear slide 150 is to provide a means for permitting traverse ofthe thickness center 162 across the width of the sheet coil 10, whilecapturing thickness measurements during traversal.

Mounted to the end of the linear slide 150 is a control box 164, whichcontains both mechanical and electronic elements for the gauge profilesystem 104. More specifically, the control box 164 can be mounted to theadjacent clamp 160. Power for the control box 164 can be provided as ACpower 166 through a power cord 168. Further, if desired, signals can betransmitted between a desktop computer or the like (not shown) and thecontrol box 164 through antenna 170. These signals are illustrated asspatial signals 172 in FIG. 4. It should be noted that FIG. 6illustrates the linear slide 150 in the absence of the thickness sensor162.

More specifically with respect to FIG. 6, the control box 164 isillustrated with the absence of a control box cover 174, which isillustrated in FIG. 14. As shown primarily with respect to FIGS. 6 and13, the gauge profile system 104 includes a driver belt system 176, themajor components of which are located within the control box 164. Asshown primarily in FIG. 13, the driver belt system 176 includes a drivepulley 178 having a stepper motor belt 180 positioned on the pulley 178.The pulley 178 is attached to a drive axle 182.

With reference now to FIGS. 4,6,13 and 15, the internal components ofthe control box 164 include a stepper motor 184. The stepper motor 184can be a commercially available product. For example, a stepper motorwhich the inventors have found to be operable in testing of an exemplarygauge profile system 104 is one which is utilized for low speed and lowtorque applications. The motor also should have relatively high accuracyand high resolution characteristics. In this regard, a torque, speed andpower graph for a stepper motor 184 which may be utilized in accordancewith the invention is illustrated in FIG. 7. With further referenceprimarily to FIGS. 13 and 15, the gauge profile system 104, within thecontrol box 164, also includes an encoder 186. The encoder receivessignals on symbolic line 200 from the stepper motor 184. These signalsare digitally encoded and applied on symbolic line 202 as input to amicrocontroller 188. The encoder signals applied as digital inputsignals to the microcontroller 188 on line 202 provide various motorcharacteristic information, including position information for themicrocontroller 188. In a feedback configuration, the microcontroller188 also applies digital signals on line 204 as input signals to thestepper motor driver 190. The physical representation of the steppermotor driver 190 is illustrated in FIG. 13, and the symbolic functionalrepresentation is illustrated in FIG. 15. The digital signals appliedfrom microcontroller 188 on line 204 to the driver 190 essentiallycomprise control signals for the driver 190 to appropriately operate thestepper motor 184 so as to cause the thickness sensor 162 to traversethe sheet coil 10.

In addition to the foregoing elements, the gauge profile system 104 alsoincludes limit switches 192 which are located outside of the control box162 and are positioned adjacent the clamps 158 and 160. The limitswitches 192 operate so as to limit traversal of the thickness sensor162 along the lower belt and slide arm 156. The limit switches 192 areconventional in nature and commercially available. The limit switches192, when actuated by certain positions of the thickness sensor 162,operate so as to apply digital input signals to the microcontroller 188on symbolic line 206. In turn, the microcontroller 188 will beresponsive to the digital signals from the limit switches 192 on line206 to generate appropriate digital signals on symbolic line 204 to thestepper motor driver 190, so as to control the movement of the steppermotor 184.

In addition to the foregoing elements, the gauge profile system 104,within the control box 164, also includes a wireless board 194. Serialdigital signals can be applied in a bidirectional manner between themicrocontroller 188 and the wireless board 194 on symbolic lines 208.For example, the wireless board 194 may include a WiMicro WirelessEthernet configuration with designation number 802.11. The wirelessboard 194 can transmit and receive signals on line 210, which isattached to the antenna 170 for purposes of transmission/reception ofspatial signals to a remotely located computer (not shown).

As further shown in FIG. 15, the microcontroller 188 is appropriatelyconnected to the ultrasonic thickness sensor 162 for purposes ofapplying and receiving signals on symbolic lines 212. These signals maybe transmitted on lines 212 through RS232 communication interfaces. Inthis manner, control signals can be applied from the microcontroller 188to the thickness sensor 162, while correspondingly, signals indicativeof thickness can be generated by the thickness sensor 162 and applied asinput signals to the microcontroller 188.

As shown primarily in FIGS. 8, 9 and 10, the ultrasonic thickness sensor162 is mounted to a linear bearing 216, specifically illustrated in FIG.8. The linear bearing 216 is a conventional bearing having a channel 218longitudinally extending therethrough. A set of bearing plugs 220 arelocated on each of the four opposing top, bottom and side surfaces ofthe linear bearing 216. The bearing 216 is utilized to appropriatelymove the thickness sensor 162 along the lower belt and side arm 156. Asshown in FIGS. 9 and 10, each of the bearing plugs 220 is configured soas to be threadably received within the surfaces of the linear bearing216. The actual bearing plug surfaces 222 provide bearing surfacesagainst which the lower belt and slide arm 156 will abut during movementof the thickness sensor 162. The linear bearing 216 and bearing plugs220 are commercially available and may be obtained, for example, fromFrelon.

During operation, the thickness sensor 162 is mounted onto a sensor sled224, primarily shown in perspective view in FIG. 11. With referencethereto, the sensor sled 224 includes the previously described linearbearing 216 having bearing plugs 220 with bearing plug surfaces 222.Further, the linear bearing 216 includes the channel 218 through whichis received the lower belt and slide arm 156. The sensor sled 224 alsoincludes a lower sled plate 226, onto which the sensor 162 may beappropriately mounted. The sled plate 226 is secured below the linearbearing 216 through the use of bolts 228, nuts 230 and a support plate232 on which is mounted the linear bearing 216. A clamp 234 is utilizedto adjustably secure the linear bearing 216 onto the lower belt andslide arm 156, with the adjustability being with respect to the“tightness” between the arm 156 and the bearing plugs 220.

FIG. 12 illustrates components of the end clamp 158. With referencethereto, the end clamp 158 includes a stopper sleeve 236, preferablyhaving a rubber backing on the sleeve 236. Integral with or otherwiseconnected to the stopper sleeve 236 is a sleeve bracket 238 positionedbelow the stopper sleeve 236. The sleeve bracket 238 has a right-angleconfiguration as illustrated in FIG. 12. The clamp 158 also includes anL-shaped bracket 240, also preferably having a rubber backing. Thestopper sleeve 236 is equipped with a stopper set screw 242 at the upperportion thereof. A second stopper set screw 242 is also positioned atthe lower end of the sleeve bracket 238, and is utilized to adjust therelative positions of the sleeve bracket 238 and the L-shaped bracket240. The upper set screw 242 can essentially provide for coarseadjustment, while the lower stopper set screw 242 provides for fineadjustment.

A convenient way for transporting the components of the gauge profilesystem 104 is illustrated in FIG. 14. As shown therein, the control box164 can be enclosed with the cover 174. If desired, the thickness sensor162 can be secured to the control box cover 174 through the use ofbacking, such as Velcro. Also, a lift handle 244 can be provided.

The lap count system 106 will now be described in greater detail,primarily with respect to FIGS. 5 and 16-18. With respect first to FIGS.5, 16 and 17, the lap count system 106 includes a lap count systemsupport stand 246. The lap count system support stand 246 includes alower support 248 consisting of several components. More specifically,the lower support 248 includes a series of four casters 250. Each of thecasters 250 is rotatably secured to a leg support 254 through a clevis252, which permits the corresponding caster 250 to rotate relative tothe clevis 252. Connected to or otherwise integral with the leg support254 at the center point thereof is a vertical leg 256 extending upwardlytherefrom. Positioned as desired along the vertical leg 256 is a crankbox 258. The crank box 258 can be operated and is conventionallystructured so as to move along the vertical leg 256 through aconventional rack and pinion configuration comprising a conventionalpinion gear 266 and rack 267 which is vertically mounted along one sideof the vertical leg 256. The crank box 258 includes a set of three sides262. Extending through one of the sides 262 is a conventional crank 260which, in turn, is connected to the pinion gear 266 through aconventional axle. Mounted to a fourth side of the crank box 258 is alinear slide mounting 264. The linear slide mounting 264 is connectedthrough pins 268 to the crank box 258 and to a linear slide 280. Asshown primarily in FIG. 5, the lap count system 104 also includes acontrol box 270 which can be positioned in any suitable manner on thelower support 248. The internal components of the control box 270 willbe described in subsequent paragraphs herein. As further shown in FIG.5, power is supplied to the control box 270 as AC power 272 runningthrough power cord 274. For purposes of wireless communication to adesktop computer or the like, the control box 270 also includes anantenna 276 connected to appropriate components within the control box270 for transmitting and receiving spatial signals 278 from thecomputer.

The linear slide 280 is extremely similar in structure and configurationto the previously described linear slide associated with the gaugeprofile system 104. More specifically, the linear slide 280 includes astepper motor 282 which can be utilized for purposes of moving a set ofsensing equipment 284 along slide arm 286. The sensing equipment 284, aspreviously described herein, includes a distance sensor 288 and camera290. For purposes of insuring adequate illumination, a set of lights 292is also included with the sensing equipment 284. With the foregoingconfiguration, the sensing equipment 284 can be moved vertically alongthe slide arm 286 in accordance with the functional operation of themotor 282.

FIG. 18 is a functional and partially diagrammatic illustration of thevarious components of the lap count system 106. With reference thereto,the control box 270 is shown as including a micro-controller 294 whichcan be similar to the micro-controller previously described with respectto the gauge profile system 104. Bidirectional lines 296, comprisingwhat may be RS232 and RS485 interfaces can be utilized to transmitdigital power signals to a servo amplifier 298, and to transmit andreceive bidirectional signals in the form of control signals. The servoamplifer 298 is utilized to control the motor and encoder 282. The motor282 is controlled through the servo amplifier 298, and encoding signalscan be transmitted bidirectionally on lines 300 between the encoder 282and the servo amplifier 298.

As previously described, the lap count system 106 includes theultrasonic distance sensor 288. The distance sensor 288 is controlled bythe micro-controller 294 through analog signals transmitted as inputsignals to the sensor 288 on lines 302. Lines 302 are bidirectional inthat signals can also be transmitted back to micro-controller 294,indicative of the distance sensed by the sensor 288.

In addition to the foregoing, and as also previously described, the lapcount system 106 includes a DVT area scan camera 290. The scan camera290 is also under control of the micro-controller 294 through signalstransmitted as digital power signals on line 304. Lines 304 arebidirectional and image signals can be transmitted back to themicro-controller 294 on lines 304.

The lap count system 106 can also include a wireless router 306 which iscommercially available and conventional in nature. The wireless routercan transmit and receive signals on an Ethernet basis to and from themicro-controller 294. In addition, signals can be transmitted from therouter 306 and received by the router 306 to and from the antenna 276.These signals would initially be in the form of spatial signals 278transmitted to or received from a remote computer (not shown). Inaddition to the foregoing, signals can also be transmitted to and fromthe router 306 on lines 310 with respect to the camera 290. Finally, thecontrol box 270 includes a power supply 312. With this configuration,and with the functional operation of the lap count system 106 aspreviously described herein, the average thickness of a coil can becomputed by counting the exact number of laps of the coil, as well asthe inside and outside diameters of the coil. With this informationcombined with a width measurement, the volume of the coil can bedetermined. With the volume combined with a weight measurement, theaverage gauge of the coil can also be determined. In accordance with allof the foregoing, and as shown in the drawings, a three-dimensionalgauge projection can be provided through the use of the gauge profilesystem 104 and the lap count system 106.

If desired, and in accordance with certain concepts of the invention, itis possible to utilize a processing algorithm with respect to the imagessensed by the camera 290. This is directed in substantial part to detectthe number of laps with as much accuracy as possible. For purposes ofdetecting the laps, the algorithm will look at the changes in lightintensity across the width of the image produced by the camera 290.Because of the vertical symmetry in the image, such information can betaken from a relatively small horizontal window. This fact allows analgorithm to take advantage of the camera's partial image acquisition.That is, using partial image acquisition, the camera 290 can capture andprocess a small portion of the image. This reduces the amount of datathat must be stored in memory and processed, which decreases the timerequired to process each image.

FIG. 19 illustrates an original image of the lap count as produced bythe camera 290. Correspondingly, FIG. 20 illustrates the partial imageacquisition process. Once the partial image has been captured, it can beaveraged along the columns (the columns representing the laps) toproduce a single roll of pixels representative of the changes in lightintensity across the image. An example of such averaging is illustratedin FIG. 22, which shows the result of the vertically averaged image fromthe original image illustrated in FIG. 21.

In this regard, each pixel is represented by an 8-bit grayscale value,where zero represents black and 255 represents white. FIG. 23illustrates a plot of the grayscale values along the length of theaveraged image. Each lap is visible as a peak in the graph. The lowareas in the graph are caused by the dark regions between the laps, andthe high areas are caused by the bright edges of the laps.

The peaks, however, would be difficult to detect because of the noisecaused by imperfections in the surface of the sheet coil 10 andnon-ideal lighting. In order to reduce the noise in the signal, a lowpass filter, conventional in nature, may be applied to the data. Thefrequency component of the signal, along with the low pass filterresult, is shown in FIG. 24.

The filtered data is illustrated in FIG. 25. As shown therein, the noisein the signal has been greatly reduced, and the peaks can be easilycounted with a set threshold. Also, the location of each peak can befound relative to the edge of the frame. It is important to note thatthe filter may introduce a phase shift. However, because a finiteimpulse response filter is used, the phase shift will be linear.Accordingly, the filter will only create a delay in the signal, forwhich compensation can be easily applied.

The camera can then transmit the peak locations within the image to thecomputer. In a physically realized experiment, the in-dash cameraprocessing algorithm was implemented on the Cognex 535 area scan camerausing the DVT Intellect software. The operation of the algorithm wasverified, in addition to the camera's communications. Also, apreprocessing step was added, which increased the contrast of the image.The camera was capable of executing the entire algorithm from imageacquisition to data output at a rate greater than 40 Hz. This exceedsthe desired 30 Hz.

With respect to post-camera processing, as the camera moves along theside of the coil 10, it will transmit the peak location to the computer.The computer will track the peaks as they move through the field ofview. As the peaks exit the frame, the computer will increment a count.After traversing the entire side of the coil, this count will be equalto the total number of laps in the coil.

It has been found that in order for the computer to track the laps, thecamera must capture frames at a rate of at least twice the rate at whichthe laps move through the frame. Because the frame rate is fixed, thevertical velocity should be adjusted, depending upon the gauge of thecoil to guarantee that enough samples are taken to properly representthe laps.

In addition to the camera algorithm, focus testing can also beimplemented. That is, any changes in the distance between the coilsidewall and the camera may affect the focus of the captured image.Depending upon the lens, lighting and shutter speed, the camera will beable to focus at a set distance away, within a set focal range. However,if the coil sidewall moves out of range during a test, captured imagesmay become blurry. To determine focus capability, a damaged coil wasphotographed over the damaged region. The resulting image is illustratedin FIG. 26. As shown therein, the left-most portion of the image is infocus. However, the right side of the image is out of focus because thedamaged laps have been pushed toward the camera. An algorithm was thenapplied, with the results shown in FIGS. 27 and 28. Specifically, it wasshown that the algorithm was able to successfully count the laps, eventhough certain of the laps were out of focus. In the unfiltered averageddata, the left-hand side of the image that was in focus had a relativelygreater high frequency content. The right-hand side that was out offocus had much less high frequency content, and was smoother. However,even with the loss of this data, the algorithm can easily identifyout-of-focus laps.

As earlier stated, the gauge profile apparatus in accordance with theinvention can use a gauge profile system distinguishable from the gaugeprofile system 104. A second embodiment of a gauge profile system inaccordance with the invention is described herein as gauge profilesystem 400 and is illustrated in FIGS. 29-60. Again, it should beemphasized that the resultant functions and purposes of a gauge profileapparatus utilizing the gauge profile system 400 is the same as a gaugeprofile apparatus using the gauge profile system 104.

From the prior description, it is apparent that although the gaugeprofile system 104 provides significant advantages over the prior art,the gauge profile system 104 is somewhat complex and is difficult to behandled by only one person. Unfortunately, steel companies will oftenonly have one person taking care of receiving of steel coils. Further,as occurs with any mechanical invention, the greater the number ofmoving parts, the higher the probability of maintenance and repairnecessities. Also, the track system utilized with the gauge profilesystem 104, as a result of its elongated configuration, may be damagedwithin the types of environments which exist in steel warehouses.

As described in subsequent paragraphs herein, the embodiment of thegauge profile system 400 provides a production-ready and hand-heldmeasuring device capable of measuring variations of the thickness of thetop layer of a steel coil from one edge to the opposite edge, as well asthe position from the leading edge of the coil that each measurement istaken. The gauge profile system 400 provides for a relatively highprecision in terms of measuring thickness, while also providing arelatively wide range. In addition, linear position measurements arealso provided with a relatively high precision, and with a relativelywide range. Of particular significance, the gauge profile system 400 asused for measuring the sheet coil 10 is preferably handled andrelatively easy to operate by one person. Also, the measuring processshould preferably take less time than known methods of measurement inthe prior art. Also, it is advantageous if the gauge profile apparatusis able to store or upload measurements for further analysis. Stillfurther, and again with respect to the types of environments which existin steel warehouses, it is preferable for the device to be able tooperate in a relatively severe environment, including temperatures whichmay reach 100 degrees Fahrenheit. In addition, it is advantageous if thegauge profile system being used is capable of interfacing with acomputer or network so as to download daily receiving schedules, as wellas upload measurement data.

These and other advantages are provided by the gauge profile system 400illustrated in FIGS. 29-60. A perspective view of the entirety of theprofile system 400 is illustrated in FIG. 29. An exploded view of thecase assembly for the profile system 400 is illustrated in FIG. 30 andindividual component parts are illustrated in FIGS. 31-44. Thephysically realized prototype has a weight of approximately 6.4 lbs.Power is provided by a PDA battery, while an embedded device of thesystem is powered from 4 rechargeable AA batteries. The system iscapable of at least 30 minutes of continuous use, and employs an accessdoor for fast battery charges.

Measurement thickness tolerances are in the range of 0.0001 inches,while linear position resolution is 0.0169 inches, or 60 counts perinch. The range for material thickness is 0.01 to 0.75 inches. Thelinear position range is 0.25 to 82 inches. Further, in accordance withthe physically realized embodiment, internal memory for a PDA was 192 MBROM. An external memory with SD for back up was also provided. Storageon a network was provided through a PDA WiFi.

With respect to the user interface, a graphical user interface with anLCD display was used. Button-type enabling switches were utilized forvarious software functions. If desired, a software keypad can also beprovided on the PDA screen, for purposes of identifying sheet coils.With respect to other specifications, all tolerances were met with anenvironment of up to 100 degrees Fahrenheit. Drop resistance wasprovided for up to 4 feet. In addition, the system 400 is preferablysplash resistant.

Turning specifically to FIGS. 29-44, the gauge profile system 400 has aconfiguration as particularly shown in FIGS. 29 and 31, in perspectiveview. The gauge profile system 400 includes a case cover 402 forprotecting instrumentation within the severe environment. A PDA 404 isprovided, which can be conventional and commercially available. Anultrasonic test 406 is also provided. The entirety of the profile system400 or case assembly 400 also includes a rectangular-shaped top plate408, with a cleat 410. A control board 412 is also provided, withelectronics associated with the controller residing thereon. The profilesystem 400 also includes the wand handle 414. In addition to theforegoing, strain relief is provided by the strain relief device 416.Two power switches are provided, identified as power switches 418 and424.

As earlier stated, the profile system 400 can be powered in part byinternal batteries. The batteries are held through a top battery clamp420 and a bottom battery clamp 426. In addition, for purposes ofcharging, a PDA charge connector 422 is also provided. For purposes ofindicating proper operation, a power indicator light 428 is additionallyprovided.

With respect to the strain relief 416, a roundabout 430 is also providedand secured to the strain relief device 416. As described in subsequentparagraphs herein, the gauge profile system 400 also includes a stringencoder 432.

In addition to the previously described elements, the profile system 400also includes a back plate 434. Magnets 438 are provided for purposes ofreleasably securing the profile system 400 to a stand or the like, whilenot in use. Also, the magnets 438 provide for a means of releasablysecuring the profile system 400 to the sheet coil 10 to be measured,during operation.

The entirety of the profile system 400 or case assembly 400 is alsoshown in FIG. 31. FIG. 32 illustrates the case bottom 436.Correspondingly, FIG. 33 illustrates, in perspective format, the casebottom plate 440. The case top plate 408 and the case roundabout 430 arefurther illustrated in FIGS. 34 and 35, respectively. In addition, FIG.36 illustrates a PDA standoff 444, while FIG. 37 illustrates an Olympusstandoff 446. The bottom battery clamp 426 and the top battery clamp 420are further illustrated in FIGS. 38 and 39, respectively. In addition tothe foregoing, FIG. 40 illustrates the wand assembly 454, manually heldby the operator during use of the gauge profile system 400. The wandassembly 454 includes the previously described wand handle 414. Inaddition, the wand assembly 454 includes the wand bottom plateillustrated in FIG. 42, the wand main 450 illustrated in FIG. 43, andthe wand cover 452 illustrated in FIG. 44.

FIG. 45 is a diagrammatic view illustrating the functional andinterconnected relationships among the lap count system 106, a network456 and the various devices associated with the gauge profile system400. Specifically, the lap count system 106 can correspond to the lapcount system 106 previously described in detail herein with respect tothe gauge profile apparatus 100. The network 456 can include anyconventional network to which the appropriate data may be applied. Afunctional relationship between a gauge profile system and a lap countsystem was previously described herein and illustrated in FIG. 3. Thefunctions performed by the system illustrated in FIG. 3, using theaverage lap gauge data from the lap count system 106 and theoutside/inside lab profile data from the gauge profile system will alsobe utilized by the network 456 in the same manner. That is, the ultimateoutput desired through the use of the gauge profile apparatus using thegauge profile system 400 in accordance with the invention is an averagethree-dimensional profile over the length of a sheet coil 10. As withthe gauge profile system 104 previously described herein, the gaugeprofile system 400 utilizes an ultrasonic gauge device (i.e., theultrasonic tester 406) for purposes of bombarding the sheet coilmaterial with high frequency sound waves. This information from thetester 406 is applied through an RS-232 interface to an interfacingmicrocontroller board 412. The RS-232 interface from the ultrasonictester 406 to the microcontroller board 412 can have the followingspecifications: 19200 baud; 8 bits; 1 stop bit; no parity; and no flowcontrol. Correspondingly, the PDA 404 has bidirectional communicationwith the interfacing microcontroller board 412. This communication isalso provided through an RS-232 interface, which may have the samespecifications as the interface between the ultrasonic tester 406 andthe microcontroller board 412.

Correspondingly, the string encoder 432 can be utilized to connect to anencoder counter circuit (also on the microcontroller board 412) througha 3-channel (e.g., A, B, Z) quadrature interface. The encoder counterrelays encoder counts to the serial interface circuit through the use ofa 16 byte data bus. In addition to the foregoing, the PDA 404 may beutilized with the network 456, through bidirectional transmissionbetween the network 456 and the PDA 404 using an 802.11b wirelessconnection to a main computer or the like for purposes of appropriatecommunications. A corresponding wireless connection can also be made soas to provide bidirectional communication between the lap count system106 and the network 456. Again, it should be emphasized that the databeing provided to the network 456 by the gauge profile system 400corresponds to the same type of data generated by the gauge profilesystem 104 previously described herein with respect to the gauge profileapparatus 100.

In operation, the gauge profile system 400 will typically be used bysheet coil receiving personnel for purposes of gathering data to createa cross-section of the thickness of one layer of the steel coil 10 fromthe leading edge of the coil to the opposite edge. At the beginning of aday, the operator would likely remove the gauge profile system 400 froma charger, and enable power. Once powered, the gauge profile system 400can be programmed so as to automatically be connected to a wireless areanetwork associated with the operator's company. The gauge profile system400 may then be programmed so as to either automatically download dailycoil receiving information, or instruct the operator to download dailycoil receiving information from the network 456.

When a sheet coil 10 is received, the operator may take the profilesystem 400 off of the charger and mount it to one side of the sheet coil10 using the magnets 438 located on the back side of the case assembly.When the profile system 400 is mounted to the coil 10, the operator canthen select the correct coil ID and measurement mode from drop downoptions associated with the PDA 404. When successfully completed, theoperator can press the “gauge test” button, so as to begin triggeringmeasurements to be stored in the PDA 404. When the operator is finishedtaking measurements, the operator can press a “done” button located inthe software associated with the PDA 404. When the button is pressed,the PDA 404 will stop the measurement process, analyze the collectedmeasurement data, and upload the data and analysis to a specifiedlocation on the network 456. When the gauge profile system 400 is not inuse, it is preferably plugged into an appropriate charger. A sketch ofthe profile system 400 in use (absent the operator) is shown in FIG. 46.Simulated image file information and data that may be saved areillustrated in the representative screens of the PDAs 404 shown in FIG.47.

The linear measurement provided by the gauge profile system 400 isachieved through the use of the string encoder 432. Such devices arecommercially available. The underlying technology of the string encoder432 is a rotary encoder utilizing three signals (i.e., A, B and Z).Signals A and B are generated 90 degrees out of phase so as to indicatedirection, while signal Z acts as a “home pulse” (which indicates a fullrevolution). A shaft of the encoder 432 can be attached to a spool ofstainless steel cable 458 illustrated in FIG. 46. As the cable 458 isunspoiled, the shaft of the encoder 432 rotates, and AM channels arepulsed in quadrature (i.e., 90 degrees out of phase with respect to oneanother). Rising and falling edges of the channels A and B can beinterpreted to increment (with the shaft turning clockwise) or decrement(with the shaft turning counter-clockwise) the total number of encodercounts. Channel Z is used to confirm the total number of counts. Theencoder counts are interpreted as a linear position by multiplying thetotal number of counts by the encoder's resolution. The resolution istypically given in inches per count.

As earlier described, the gauge profile system 400 includes the PDA 404.An example and commercially available PDA which may be utilized as thePDA 404 is the HP iPaq Hx 2495 PDA. The PDA 404 acts as the major meansof communication, storage and analysis for data collected aboutindividual coils from the linear and ultrasonic measurement devices. ThePDA 404 also acts as a user interface to the measurement sensors anddata which are stored on the network 456. The operator can start ameasurement from the PDA 404 by selecting the appropriate options andcoil ID, and then pressing a software button “start.” The device canthen wait for serial data from the embedded device, which sends data inthe format of “distance, thickness” where distance is a linear distancefrom the edge of the coil in encoder counts, and thickness is thethickness of the coil at the linear distance in inches where ameasurement has been taken. After successful reception of data from theembedded device, the PDA 404 can respond with an “*” to indicate that ithas successfully received and parsed the data. If data reception wasunsuccessful, the PDA 404 can respond to the embedded system with an “X”so as to indicate that the data was not received correctly, and that theembedded device should resend the data. When the operator has completedcoil measurements, the “end” button can be pressed, and the PDA 404 cansend the “end” command to the embedded device, so as to let it know thatit is no longer accepting measurement data. This function can alsoindicate to the PDA 404 to begin analysis of the data.

The data that has been collected can be compiled into a text file and a“line of best fit” can be computed. The line of best fit can be plottedwith real data points, and saved as an image file. Accordingly, both thetext file and the image of the plot can be uploaded to a specifiedlocation on the network for later review. An example set of equationsfor the “curve-best-fit” analysis is illustrated in FIG. 60, which alsoindicates the definitions of the variables.

The interface microcontroller board 412 can include twomicrocontrollers, associate control communications and encoder counting.The board 412 can also act as a means for powering the ultrasonicmeasurement device 406.

One of the microcontrollers can act as the interconnect between the PDA404 and the measurement devices, as well as providing visual feedback tothe user through the use of LEDs. This microcontroller can wait for astart command from the PDA 404, which can essentially notify themicrocontroller to start the measurement process with or withoutinterval measuring enabled. If the microcontroller receives a startcommand without interval measuring enabled, then it will wait for andrelay valid measurements of distance and thickness to the PDA 404without indicating when the operator should take the measurements. Ifthe microcontroller receives the start command with interval measuringenabled, it will wait for and relay valid measurements of distance andthickness to the PDA 404, while indicating points at which the operatorshould take a measurement through use of different colored LEDs.

When the measurement process is initiated, the ultrasonic measurementfrom the tester 406 will continuously send thickness measurements at anapproximate rate of 16 Hz. The microcontroller 412 can continuouslyparse this thickness data and determine validity. If valid, thethickness measurement is relayed along with the linear position to thePDA 404. This process will be repeated until the microcontrollerreceives an end command from the PDA 404.

The second microcontroller can function as an encoder counter, and maybe clocked at a speed of 20 MHz, in order to count encoder pulses asfast as possible. As earlier described, the signals into thismicrocontroller from the string encoder 432 are signals A, B and Z. TheA and B signals are square pulses, where B is 90 degrees out of phasefrom A (this is for purposes of determining if the string or cable 454is being pulled out or retracted in). Signal Z is a home pulse toindicate that there has been one full resolution. The encoder counts arerelayed from this microcontroller to the first microcontroller through a16 byte data buss. A reset line comes from the first microcontroller andis used to reset the encoder count values.

The power supply circuit can include two subsystems. The first can be asolid state power multiplexer designed to switch between two possiblepower connections, namely USB buss power and batteries. The secondsubsystem can be a voltage regulator. Commercially available voltageregulators appropriate for these purposes are available from LinearTechnologies. The regulator is configured in a SEPIC mode. This modeallows regulation of an input voltage, in the range of 3 to 7 volts,with the output voltage at 5 volts. The regulator is necessary, sincethe USB voltage can range both above and below 5 volts. The low batteryindicator function of the regulator is set up so as to drive low whenthe input voltage drops below a particular threshold.

Serial interfacing can be provided at plus and minus 10 volt levels. Alogical multiplexer can be used to split the data transmitted from thecomputing option. If the USB is connected, then the USB port will be aprimary mode of communication. The interconnect board 412 will send datato both the serial port and the USB port. If the USB port is not pluggedin, then the interconnect board will only receive data from the serialport.

The ultrasonic sensor 406 can use a delay line transducer with a drycouplant so as to take thickness measurements of one layer of the steelcoil 10. The measurements can have a resolution of 0.0001 inch. Themeasuring device will send thickness data to the serial port at apredefined rate. The tester 406 essentially works by transmitting anultrasonic sound wave through the target material, and analyzing thereflective wave to determine the thickness. This concept of transmittingultrasonic sound waves and appropriate means for analysis to determinethickness were previously described herein with respect to the gaugeprofile system 104.

For purposes of further description and detail, the wand assembly 454 isfurther shown in FIG. 49. The wand assembly 454 is also shown in anexploded view in FIG. 50. FIG. 50 illustrates the wand base or bottomplate 448, main 450, cover 452, delay line transducer 459 and the strainrelief 416.

FIG. 51 illustrates a block diagram for the serial relay controller. Thediagram is essentially self-explanatory. The controller essentiallywaits for a command from the PDA 404. When received, the command isprocessed so as to determine validity. If the command is a startcommand, the gauge test is initiated and thickness data and data countsare received and determined. More specifically, thickness data and datacounts are continued until end signals are received. Correspondingly,FIG. 52 is a block diagram for the end counter count controller. Thediagram is self explanatory, and essentially provides the functions ofsequentially making counts and determining when the counting processshould end.

FIG. 53 is a functional state diagram of the PDA software which will beincorporated within the PDA 404. Again, it is believed that this statediagram is self explanatory, but will be set forth in greater detail insubsequent illustrations herein. Essentially, following an initiation orstart of the process, function states include the addition of a newsheet coil 10, gauge testing, processing of collected data, datatransfer and the importation of data files associated with the sheetcoils 10. FIG. 54 illustrates a state functional block diagram for thestart command. Essentially, a screen is displayed for the operator, soas to indicate start up. Software information is then further displayed,along with tags lists for the sheet coils. The operator may addadditional tags and then initiate testing. The state will also allow theoperator to visualize the plots of the collected tests and the overallresults. FIG. 55 is a state functional block diagram for the “add newcoil” state. In this state, the coils information form that the operatormust fill out is displayed. If the operator does not discard orotherwise cancel the operation, the input information is added to thedatabase, and the list of selectable coils is updated.

FIG. 56 illustrates a state functional block diagram for the “inputcoils data file” state. This state allows the operator to add a list ofcoils from the file. Again, if the operator does not cancel theoperation, the input information is put into the database and the listof selectable coils is updated.

FIG. 57 illustrates a state functional block diagram for the “gaugetesting” state. In this state, serial commands are transmitted to theappropriate microcontrollers so as to initiate the gauge test for theselected coil. A “listen” operation is then performed on the serialport, so as to retrieve the distance and thickness measurement. If theoperator cancels the test, the test is stopped and the results arediscarded. If the operator finishes the test, the measurements areappropriately stored. FIG. 58 is a state functional block diagram forthe “data transfer” functions. In this state, a TCP server isestablished, to which data is to be transferred. The operator thenselects a data file, and the data file is transferred to the connectedclient. Correspondingly, FIG. 59 is a state functional block diagramillustrating the “process the collected data” state. In this state, acomputation is made of the “best-fit” value. The data is then plottedand stored.

In accordance with all of the foregoing, a second embodiment of a gaugeprofile system 400 has been described and illustrated herein.Advantageously, the gauge profile system 400 can operate with only oneoperator. Further, the gauge profile system 400 has relatively fewmoving parts. Also, the profile system 400 is relatively compact,thereby reducing the probability of damage when used in relativelysevere environments.

In addition to the lap profiler (or gauge profile system), for whichembodiments 104 and 400 have been previously described herein, a furtherembodiment of a lap counter (also referred to herein as a radialscanner) has been conceived and developed in accordance with theinvention. This radial scanner or lap counter system assembly inaccordance with the invention is identified herein as the assembly 600,and illustrated in FIGS. 62-75. In accordance with prior description,the entirety of the gauge profile system includes the lap profiler orgauge profile system to determine the relationship between the edgethickness of the top laps and the lap thickness at any point along thewidth of the coil. This relationship is then used to determine thethickness of any interior lap based on the particular edge thickness ofthe lap. For purposes of determining edge thickness of each interiorlap, the radial scanner or lap counter is utilized.

More specifically, the radial scanner or lap counter in accordance withthe invention utilizes a pair of reflectance lasers, in combination witha highly accurate positioning system. As the lasers translate along aradial line of the coil, the positioning system analyzes the data fromthe lasers, and detects the edges of the laps. When an edge if found,the system can pause and rescan the area around the found edge. Thepurpose for the rescans is to produce a statistical model that is usedto more accurately estimate the true position of the lap edge. Thispositional difference, along the radial line, between subsequent lapedges is then used to determine the thickness of the lap. Further, theradial scanner system in accordance with the invention monitors the edgepositions as found by both lasers, and adjusts the measured thickness ofthe lap, based on the current non-radiality of the radial scanner system600.

With reference to FIGS. 61 and 62, the laser system 600 can include apair of lasers commercially available and identified as Keyence LV-H37lasers. The lasers are utilized to measure reflectance with a CMOScamera. The system will then output analog voltage signals from anamplifier, with the voltage signals representative of the measuredreflectance. As shown in FIG. 62, the presence of a high voltage isindicative of the presence of a lap. A low voltage signal is indicativeof no lap being present. In one particular physically realizedembodiment, the laser beam diameter was 0.0002 inches, and the laserpower was 1.5 W at 12-24 VDC.

The reason for utilizing a pair of lasers is shown through theillustrations of FIGS. 63 and 64. With a single laser, a measurementtaken along a non-radial line would result in a thickness being reportedwhich is greater than the actual thickness. When a measurement is takenalong a radial line, the outputs of the pair of lasers should beidentical. If they are not, an algorithm can be utilized to obtainactual lap thickness. FIG. 64 is a table identifying reported thicknessversus nominal thickness, along with the angle of the radial line.

For purposes of moving the lasers, a linear encoder can be utilized, asshown in FIG. 65. With the particular encoder utilized, it had beenfound that the encoder returned to position is accurate to plus or minus0.0001 inch. Outputs can be positioned directly over an RS-232interface. The lasers will be moved manually along the linear encoder.This is for purposes of saving weight and power consumption. However, toensure appropriate movement, an indicator light can be used to indicateto a user if the carriage of the encoder is being moved too quickly.

FIG. 66 refers to the concepts earlier mentioned regarding the findingof the lap thickness. As earlier stated, the laser outputs identifyreflectance as analog voltage signals. The signals can be converted todigital signals with a microcontroller. A high reflectance is indicativeof a lap edge, while a low reflectance is indicative of a gap. Thelinear encoder can be utilized to give the position of the lasers ininches.

Various methods can be utilized to determine lap thickness. FIG. 67 is agraph showing raw data from an actual measurement of reflectance versusdistance. With this graph, a method known as “local minima” procedurescan be utilized to determine lap thicknesses as distances between localminima. This procedure gives the highest possible lap thickness with thelaser concepts.

Another method is typically identified as the midpoint method. FIG. 69includes a graph of raw data, again showing the reflectance versusdistance. The insert within FIG. 69 illustrates the concept that the lapthicknesses are determined as distances between midpoints of a data/cutoff intersection line. A further method for determining lap thicknessutilizes curve fitting principles. Again, a graph showing reflectanceversus distance is illustrated in FIG. 70, with FIG. 70 further showingan enlarged portion indicating that a polynomial fit is made withrespect to the original data. The lap thicknesses are characterized asbeing distances between minima of the fit data. It should be noted thatthe curve fit data all exist below the cut off line.

In a physically realized embodiment of the radial scanner system inaccordance with the invention, battery power was utilized using 10 AhNiMH 24V. The battery power included a 4 hour battery life and chargingtime. The radial scanner system utilizing the lasers weighed in therange of approximately 30 pounds, thereby meeting a portabilityrequirement.

FIG. 72 is a concept block diagram illustrating the pair of lasers whichgenerate analog signals applied to respective ones of a pair ofamplifiers. Analog signals from the amplifiers are then applied asinputs to a microcontroller. The microcontroller also accepts inputsalong an RS-232 interface from the linear encoder. Output signals fromthe microcontroller are applied as inputs to a Wi-fi module through anRS-232 interface. If desired, signals can be applied from the Wi-fimodule to a Wi-fi router. Signals from the router can then be applied toa host computer through an Ethernet or similar network.

FIG. 73 identifies various parameters associated with a proof of conceptfor the radial scanner system in accordance with the invention. Thelasers were mounted to a side/stepper motor, with an average of tenreadings being taken per step. Twenty five tests were undertaken foreach of five laps of 0.025 inch nominal, and five laps of 0.160 inchnominal steel. For purposes of increasing accuracy, the carriage wasallowed to rest for 80 milliseconds. As also shown in FIG. 72, datarepresenting output positions can be transmitted over a serial port to alaptop or the like. FIG. 74 identifies various statistics associatedwith proof of concept tests utilizing the 0.025 inch nominal steel andthe 0.160 inch nominal steel. These results are shown using the localminima, midpoint and curve fit methods for determining lap thickness.

FIG. 75 is a perspective and exploded view showing one embodiment of aradial scanner system in accordance with the invention. In accordancewith all of the foregoing, a second embodiment of a radial scannersystem 600 has been described and illustrated herein.

It will be apparent to those skilled in the pertinent arts that otherembodiments of gauge profile systems in accordance with the inventioncan be designed. That is, the principles of systems in accordance withthe invention are not limited to the specific embodiments describedherein. Accordingly, it will be apparent to those skilled in the artthat modifications and other variations of the above-describedillustrative embodiments of the invention may be effected withoutdeparting from the spirit and scope of the novel concepts of theinvention.

What is claimed:
 1. A gauge profile apparatus adapted for use with asheet coil for determining an average three-dimensional profile over thelength of the coil, said profile apparatus comprising: a gauge profilesystem having first processing means for determining the relativedistribution of material of said sheet coil for a cross-section of saidmaterial, said gauge profile system having an ultrasonic gauge devicefor bombarding said material of said sheet coil with high frequencywaves; a lap counting system comprising an ultrasonic distance sensorand camera, for determining the average thickness of said sheet coil,through counting of a number of laps on said sheet coil and making adetermination of an outside diameter of such said sheet coil and aninside diameter of said sheet coil; said gauge profile apparatus havingsecond processing means for determining said average three-dimensionalprofile by calculating an average lap gauge using coil weight, materialdensity and width as inputs, and further using an assumption thatrelative thicknesses between edge gauges and corresponding crown gaugesare relatively constant; said gauge profile system comprises a portable,hand-held measuring device capable of being carried and movable by asingle user, for measuring variations of the thickness of the top layerof said sheet coil from one edge to an opposite edge, as well as theposition for a leading edge of said coil from which each measurement istaken; said apparatus further comprises a string encoder for providing alinear measurement generated by said gauge profile system; said lapcounting system comprises a radial scanner having a pair of reflectancelasers and a positioning system for analyzing data from said lasers anddetecting lap edges; said positioning system configure to pause andrescan an area around said detected edge for more accurately estimatinga true position of a lap edge, and wherein said rescans produce astatistical model which provides a more accurate estimation of the trueposition of said lap edge.
 2. A gauge profile apparatus in accordancewith claim 1, characterized in that said string encoder is connected toan encoder counter circuit located on a microcontroller board through athree-channel quadrature interface.
 3. A gauge profile apparatus inaccordance with claim 2, characterized in that said encoder countercircuit relays encoder counts to a serial interface circuit through theuse of a 16 byte data bus.
 4. A gauge profile apparatus in accordancewith claim 2, characterized in that said microcontroller board comprisestwo microcontrollers, a first microcontroller corresponding to anassociate control communications, a second microcontroller correspondingto the encoder counter circuit.
 5. A gauge profile apparatus inaccordance with claim 1, characterized in that said positioning systemanalyzes data from said lasers, and detects edges of said laps, as saidlasers translate along a radial line of said coil.